Susie probably has a different perspective, but I think the limitations are more just the personal limitations of people. It takes a little bit of time for people to step back and look at the whole supply chain and not just their particular role in it.
We want to reduce costs, make the pie bigger, and increase revenues, so the whole supply chain can grow. That just takes a while. People need to get comfortable. People who are usually adversaries have to get comfortable with each other at the table. That to me is the biggest limitation, but it's one that usually has been overcome in time.